Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
  • B23B31/02—Chucks
  • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
  • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
  • B23B31/20—Longitudinally-split sleeves, e.g. collet chucks
  • B23B31/208—Longitudinally-split sleeves, e.g. collet chucks with a tool positioning stop
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
  • B23B31/02—Chucks
  • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
  • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
  • B23B31/20—Longitudinally-split sleeves, e.g. collet chucks
  • B23B31/201—Characterized by features relating primarily to remote control of the gripping means
  • B23B31/2012—Threaded cam actuator
  • B23B31/20125—Axially fixed cam, moving jaws
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
  • B23B2231/06—Chucks for handtools having means for opening and closing the jaws using the driving motor of the handtool
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
  • B23B2231/20—Collet chucks
  • B23B2231/2005—Keys preventing rotation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
  • B23B2231/20—Collet chucks
  • B23B2231/2027—Gripping surfaces, i.e. the surface contacting the tool or workpiece
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
  • B23B2231/20—Collet chucks
  • B23B2231/2083—Collets comprising screw threads
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2260/00—Details of constructional elements
  • B23B2260/106—Nuts

Definitions

• the invention relates to a collet chuck according to the preamble of claim 1, for clamping a preferably
• cylindrical tool shank serves, and has a chuck body, a collet and a cap nut, the like
• the collet can be driven by tightening the nut so in the chuck body that they are ready for work in the tool shank
• a typical clamping device of this type comprises on the one hand the tool holder, which has a common interface with the spindle at one end.
• these standardized shapes are the hollow shaft taper, short HSK, or the steep taper, abbreviated SK.
• the axis of rotation of the tool holder and the tool with the spindle should be as far as possible congruent in order to avoid an imbalance.
• a typical tensioning device comprises a
• Clamping area is created by the chuck, which is located on the side facing away from the spindle.
• Clamping can be designed in various ways.
• the clamping area is a cylindrical bore formed, which is based on the diameter of the tool shank to be clamped.
• Collet chuck established.
• a chuck is not constructed as a cylindrical bore, the clamping area is formed by a conical contact surface, which tapers towards the spindle.
• the tool is designed for use in one
• Collet chuck is first inserted into a so-called collet, which has a cylindrical receiving bore in its center for the
• Collet chuck on the other hand has.
• the collet is inserted together with the tool in the chuck of the tool holder and then usually by the use of a
• a collet chuck for clamping a preferably cylindrical tool shank having a chuck body, a collet and a
• union nut Includes union nut. These components are coordinated so that the collet can be driven by tightening the nut so in the chuck body that it sets the tool shank ready for work in the collet chuck.
• the tool shank is in any case then "ready to work” when between him and the collet, the torque can be transmitted, which is needed to connect with the system of the
• Tool shank can sum in the axial direction.
• a form-fitting pull-out protection can be involved in all this, but preferably at least the majority of all required forces are applied by frictional engagement.
• the invention is characterized in that the collet and the union nut are permanently connected to each other and at the same time rotatable relative to each other.
• a connection in the context of the invention is usually only an immediate connection between the nut and the
• a permanent compound in the sense of the invention is
• Embodiment the respective elements but still, in a separate process, outside of their operational use in production, preferably non-destructively resolved - to allow about repair work and the replacement of damaged parts.
• Union nut according to the invention a forced centering or pre-centering of these two components is achieved relative to each other, so that can achieve even with careless assembly high accuracy and excellent concentricity - while good damping by the collet.
• High-speed machining (HSC) disadvantageous.
• shrink fit chucks also guarantee a very good concentricity from the very beginning, due to the design.
• various solution concepts have been proposed in the prior art, which bring here actually remedy, but with other disadvantages.
• DE 10056729 A1 proposes a collet chuck which has an integrated clamping mechanism which operates with a gear via which high forces can be generated. These are sufficient to pull the collet into the chuck body with a gripper which acts on its end facing away from the tool side, thereby firmly closing it.
• the collet is then driven into the chuck body with the help of an external press so tightly that it holds the tool shank in a similar rigid manner as a shrink chuck. Due to the said self-locking, the collet retains the position in the chuck body into which it has been driven by the press. Unscrewing a union nut can be omitted or is optional as an additional safeguard.
• the collet and the union nut are rotatably supported on each other via rolling elements with preferably barrel-shaped, conical or cylindrical shape.
• the rolling elements roll off each of the collet and the union nut, so that the
• Union nut and the collet on the rolling elements act directly on each other, without the detour via an intermediate disc or an intermediate ring, which is or possibly set against rotation on the chuck body.
• at least 8 rolling elements are provided per bearing point, more preferably at least 10 or 12.
• collet chucks can be used for the first time
• the collet chuck carries a set of rolling elements in a V arrangement whose rolling elements are arranged such that the perpendiculars intersect with the axes of rotation of the rolling elements only in the interior of the chuck body on its feed longitudinal axis or working axis of rotation.
• Working axis of rotation in a range between 25 ° and 55 °.
• the collet chuck is formed so that it carries a second set of rolling elements in V-arrangement, whose
• Rolling elements are arranged so that the perpendicular to the axes of rotation of the rolling elements cut only outside of the chuck body on the Futterlhacks- or working axis of rotation, preferably including the same angle with the Futterlhacks- or working axis of rotation as in the o. first set of rolling elements. This makes it possible, otherwise usually under the influence of
• the collet chuck is designed so that the
• Union nut are installed. This configuration makes it possible to build a very compact chuck, without taking special account of how the rolling elements are mounted.
• the union nut Preferably, in the union nut, only a local opening is provided for mounting the rolling elements, which is so large that the
• Union nut can be pushed or rolled into it. Such, local opening leads only to a small weakening and can be easily closed, z. B. by a
• Screw plug a press-in closure or a
• Closure preferably in the form of a pin.
• Collar carries on its outer peripheral surface a preferably designed as a groove buried in it groove for the rolling elements.
• Has locking groove or with a blocking element or a Sperrvorspung and the chuck body is designed to complement it.
• Union nut section can be prevented.
• the collet may be out of round and / or over its entire length
• the anti-rotation device according to the invention need not necessarily be designed as a non-circular or polygonal section. Also a
• Embodiment the collet on a locking groove, which has both a longitudinal portion, d. H.
• Locking groove begins at the rear end, ie on the side facing away from the union nut portion. This makes it possible to introduce the composite according to the invention without having to remove a blocking element.
• the blocking elements or locking projections can be designed in various ways, for example as fastened in the tool holder
• the blocking elements are embodied as one-piece integral with the tool holder and protrude into the clamping region as pins extending obliquely to the axis of rotation. It goes without saying that a reverse construction is possible, d. H. that the collet comprises the locking elements, while locking grooves are formed in the holder.
• Length adjusting screw has.
• the collet chuck is equipped with a collar, which rests flat in the clamped state on the front side of the chuck body.
• the union nut may have an inside end face, which rests flat in the tensioned state on the front side of the chuck body. It is particularly preferable to have a multi-start thread and / or a thread designed as a trapezoid thread or ball thread
• At least one of the two thread flanks of a thread can form an angle of between 85 ° and 90 ° relative to the tool axis, or even be substantially 90 °.
• a favorable design possibility is that the chuck body at its outer periphery between its front side u an external thread for screwing the nut a
• Has damping element which surrounds the chuck body at its outer periphery ideally annular.
• the chuck body may have a damping element on its front side facing the union nut.
• Chuck body on its outer periphery has a contact surface, which with a corresponding counter-contact surface on the inside of the
• Union nut interacts and centered the union nut so positively against the chuck body. Such a design is not least then particularly useful if the thread between the chuck body and the nut z. B. as
• Thread-independent centering is ensured.
• the outer side of the chuck body may have a conical shape, which tapers towards the tool-side end. This allows the tool holder to be made slimmer. It goes without saying that the voltage applied to such a conical region of the tool holder
• Union nut portion of the composite also, at least on the side facing the axis of rotation, having a corresponding conical shape, so that in turn is preferably in turn comes to a centering of the nut.
• the nut portion of the composite also, at least on the side facing the axis of rotation, having a corresponding conical shape, so that in turn is preferably in turn comes to a centering of the nut.
• collet and / or the union nut and / or the chuck body preferably at least in the region in which they form-fit contact with each other, to improve the mechanical properties
• Sliding coating and / or a wear protection coating are used, such as a carbon coating or another hard coating.
• the collet and / or the union nut each having a plurality of differently coated areas. It is important to remember a wear-resistant coating on the collet and the union nut in the area where the union nut and the collet act together.
• Another coating may be in the range of
• the collet has at least two different types of slots, in particular those which, in relation to their length, extend in the direction parallel to the slot
• Collet a tread for rolling elements is formed, not slotted, but forms in the circumferential direction a continuous self-contained ring.
• the collet has a form-locking
• Extractor can interact on the tool shank, creating a pull-out protection for the tool is formed.
• the chuck body thereby have a collet holder with an inner cone whose cone angle is less than or equal to the outer cone of the collet.
• individually adapted tool has become a work unit for a particular cutting machine tool.
• Collet chuck sought, consisting of a collet and a union nut, which are permanently connected to each other and at the same time rotatable relative to each other.
• Collet chuck and at least two collet units according to the invention wherein the collet chucks have collets whose tool clamping ranges different
• Shank diameter can be clamped.
• Fig. 1 shows a sectional view of a first embodiment of the collet chuck.
• Fig. 2 shows a 3D view of the collet chuck.
• FIG. 3 shows a detail enlargement from FIG. 1.
• Fig. 4 shows an overall sectional view of a second
• Fig. 5 shows an enlarged partial section of a second
• Fig. 6 shows a further enlarged section of the region of a rolling body in a groove of the union nut and the counter groove of the chuck body.
• Fig. 7 shows a view of the WälzMechlafigs of the second
• FIG. 8 shows a sectional view along the section line marked with the letters AA in FIG.
• FIG. 10 shows a detail of a side view of FIG. 7.
• FIG. 1 shows the collet chuck (1) according to the invention in the clamped state without showing the tool.
• the union nut 4 has already been tightened so far that the collet 3 is almost completely driven into the chuck body 2.
• Union nut here both each have a rolling element tread have in the form of a groove incorporated in it, which has a V-shaped cross-section in the concrete case, a number of rolling elements 5 are provided which produce a positive connection between the nut and the collet.
• FIG. 3 which shows a
• FIG. 1 Sectional enlargement of FIG. 1 represents.
• the rolling elements rotate around their respective dash-dotted lines
• the rolling elements and the grooves receiving them are designed so that they hold the union nut and the collet with little or - due to transitional fit or slight preload already in the unloaded state - eliminated game, so at least bring about a pre-centering of these components relative to each other.
• the closure element could be an in
• the closure element has only a limited spatial extent and then closes an opening which is only so large that through them only one rolling element after the other in the
• Cutting channel from the grooves between the nut and the collet chuck can be introduced - for example, by a movement parallel to the dash-dotted axis line.
• Chuck body 2 are conical.
• the cone angle includes an angle of 0.1 ° to 4 °, preferably an angle of 0.5 ° to 3 ° with the axis of rotation 6 a.
• Collet 3 and the end face 12 of the union nut 4 on the other side shows improved damping properties of the collet chuck.
• each area of the collet 3 can be seen, in the radial direction, d. H. projects transversely to the axis of rotation 6.
• the collar 7 has an outer peripheral surface 8, which either directly adjoins the union nut 4 or, like the
• Collar 7 of the collet to the plane contact on the front side 11 of the chuck body 2 are brought.
• Chuck body 2 and the Inngengewinde 14 of the union nut 4 are formed as a trapezoidal thread.
• the area between the external thread 13 of the chuck body 2 and the end face 11 of the chuck body 2 is formed as a mating surface 15 between the union nut 4 and the chuck body 2, whereby the union nut 4 is guided during the insertion more precise, since a trapezoidal thread only one diminished
• the rear region has a section with a polygonal outer contour 9, which engages in a section of the chuck body 2 designed to be complementary thereto.
• the receptacle 10 can also be used to forward coolant and / or lubricant, which is introduced through the through hole 17.
• this serves
• Through hole 17 also to retighten a Centerneinstellschraube if necessary to adjust a tool optimally.
• FIG. 2 shows a three-dimensional image of the
• Union nut 4 on the other hand is substantially more compact than a conventional ER collet chuck and at the same time has a lower interference contour. This effect comes in particular at
• FIG. 4 shows this embodiment as a whole.
• the collet and the union nut are also connected to each other in the manner described above by rolling elements 5.
• rolling elements 5 Good to see here is also how this compound in the direction of the longitudinal axis L in front of and behind the region of the rolling elements 5 is sealed to the outside, preferably by a cord seal, and with reference to FIG 5 can be seen.
• rolling elements 5 balls can be used here or else rolling elements of the previously described, otherwise type and arrangement.
• the collet 3 is installed in the chuck body 2 as described above. By tightening the nut it is driven deeper into the conical seat and thereby closed. This will enable them to apply the necessary pressure to the tool shank used in them.
• Rolling elements 23 runs on a thread on the outer circumference of the chuck body 2, which are each held by a WälzMechkafig 18 in its intended, exact position. This will prevents the individual balls 23 come too close to each other and thus between the balls 23 undesirable friction occurs.
• the union nut 4 is seen in the direction of the longitudinal axis L before and behind the balls or rolling elements sealed to the outside, preferably by a cord seal, as shown in this figure.
• the grooves on the union nut 4 and the chuck body 2 are configured as shown in FIG. So they each have a recess 22 to which no direct surface pressure between the ball surface and the groove bottom occurs even under load.
• any foreign bodies or dirt may collect without unfolding destructive effects, such as those that occur when such particles are rolled over under load.
• the rolling element cage 18, illustrated diagrammatically best in FIG. 7, here consists of a base body 19, which has the shape of a cylinder.
• This cylinder is preferably made of plastic and is ideally thin-walled in the region of the major part of its peripheral surface. He has here then a wall thickness or thickness D of preferably less than 1 mm, see Figure 10. It is particularly favorable if the D is so small that the body ultimately forms a kind of foil, with a thickness of less than 0, 5 mm. In this way, the Wälz stressesmaschinefig 18 can change its shape to the extent necessary.
• blocks 20 protrude beyond the main body of the rolling element cage 18 in a radially outward and radially inward direction.
• Rolling is provided is bounded by at least two blocks 20.
• the blocks 20 limit the clear cross section of
• each block 20 has an extension in the radial direction, which preferably has at least 2.5 times the thickness D, which has the main body of the rolling element cage, see. FIG. 8.
• the rolling element density can be increased considerably.
• at least 40, better at least 60 rolling elements 23 are used.
• each receptacle 21 seen in the direction of rotation, a block 20 associated with the rolling element 23 and a block 20 behind the rolling element 23.
• the two blocks are located on the receptacle 21 diametrically opposite.
• the blocks 20 are of course not beyond the rolling elements 23 in the radial direction.
• the shots 21 are positioned one after another on at least one helix.
• the WälzSystemkarfig 18 is fitted in this manner along a helix with rolling elements 23 which rotates at least three times around its outer periphery.
• the union nut 4 can namely the rolling elements 23 are moved beyond the end of the groove provided for their inclusion in the chuck body 2 and / or in the union nut 4, in an area where they contact the chuck body or the nut or their
• rolling elements 23 are held securely, in their position and not only at a distance from each other, like that at a normal Wälz stressesurafig would be the case. It should be noted that as rolling elements 23 preferably balls are used.
• (K) area in the rolling body at least one side lose contact with the groove leading them when opening or closing the chuck

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Gripping On Spindles (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=55486699

Family Applications (1)

Country Status (5)

Families Citing this family (5)

Family Cites Families (21)

• 2015
  • 2015-03-10 DE DE102015002943.6A patent/DE102015002943A1/de active Pending
• 2016
  • 2016-03-09 JP JP2017547537A patent/JP6889113B2/ja active Active
  • 2016-03-09 EP EP16708706.3A patent/EP3268157A1/de active Pending
  • 2016-03-09 US US15/556,481 patent/US11278969B2/en active Active
  • 2016-03-09 WO PCT/EP2016/055047 patent/WO2016142431A1/de active Application Filing

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